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(No Model.) 2 Sheets-Sheet 1.

- .J. E. MGINTOSH.

v ADJUSTABLE VALVE SEAT. v

No. 344,190. I Patented June 22, 1886.

"NVENTEH K= CV Q/M (No Model.) 2 Sheets-Sheet 2. J. E. MGINTOSH.

, ADJUSTABLE VALVE SEAT. No. 344,190. Patented June 22, 1886.

WITNEEEESZ lNVENTURI Mm; @uwg N. PETERS, Pholo-Lithagrzphar, Wnhinpan. D. C.

EJNITED STATES PATENT FFICEO JOHN E. MOINTOSH, OF OAYUGA, NE\V YORK.

ADJUSTABLE VALVE-SEAT.

SPECIFICATION forming part of Letters Patent No. 344,190, dated June 22, 1886.

Application filed April 30, 1886. Serial No. 200,6l0.

To all whom it may concern:

Be it known that 1, JOHN E. MolNTosrr, of Cayuga, in the county of Cayuga, in the State of New York, have invented new and useful Improvements in Adjustable Valve-Seats for Steam Cylinders, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to steam-chests and valve-seats especially designed for pistonvalves.

The object of the invention is to provide simple, convenient, and efficient means for compensating for the wear of the bearings between the piston -Valve and its seat in the steam-chest, so as to maintain said bearings properly fitted and steam-tight; and to that end the invention consists in the improved construction and combination of parts as hereinafter fully described, and specifically set forth in the claims.

In the annexed drawings, Figure 1 is a vertical longitudinal section of a steam-chest embodying my improvements. Fig. 2 is a vertical transverse section on line 00 00 Fig. 1. Fig. 3 is a detached edge view of the adjustable valve-seat. Fig. 4 is a section taken on line y y, Fig. 3; and Fig. 5 is a transverse section on line a c, Fig. 1.

Similar letters of reference indicate corresponding parts.

A represents the steam-chest, the interior of whichI form with an exhaust-chamber, H, extending part way the length and width of the steam-chest, so as to form spaces I I for live steam at the sides, ends, and top of the aforesaid exhaust-chamber.

E denotes the steam-pipe, which conducts the live steam to the steam-spaces I I of the steam chest, and E is the exhaust pipe, which communicates with a duct, II,extended from the exhaust-chamber II through the side of the steam-chest. The exhaust-chamber H is formed at each end with an annular recess, 13, and from said recess to the end of the inteterior of the steam-cylinder M is extended the steam-port O.

In the recess B is seated my improved adjustable valve-seat R, consisting, essentially, of a contraetible ring which encompasses the No model.)

piston-valve P. Said ring I form of metal and sever it transversely with sufficient space between the adjacent ends of the ring to render it contractilole cireumferentially. One end of the ring is formed with a smooth eye, 0, and the other end thereof is formed with a screw-threaded eye or nut, a. A screw, D, passes loosely through the eye 0 and works in the nut n, and has back of the eye 0 a smooth stem extending through the side of the steamchest so as to be convenient of access for manipulation at the exterior of the steam-chest.

A stuffing-box, f, applied to the exterior of the steam-chest and embracing the aforesaid screw-sten1,scrves to prevent leakage of steam thereat.

On the stem of the screw D,between the eye e and adjacent wall of the steam-chest, is a rigid collar, 0, and between this collar and the aforesaid wall, and abutting against the same, is a sleeve, h, on the aforesaid screw-stem, said sleeve serving to confine the screw-stem longitudinally.

Between the collar 0 and eye e is interposed a spring, a, which presses the eye 0 toward the nut a, and by turning the screw D in the right direction the aforesaid nut is drawn to ward the eye, and thus the ring R can be contracted ciroumferentially to take up the wear between it and the valve I.

The ring It is provided with radial ports 0 O, which communicate with the steanrport O, and it is secured in the recess B by an annular plate, F, detachably connected to the end of the extension of the exhaustchamber, said plate lapping onto the ring R, and thus confining the same in the recess B.

In operating the piston-valve I? it is reciprocated rectilineally, and in its movement toward one end of the steanrchest it closes the communication between the steam-space I and ports 0 of the ring R at that end of the steam-chest and opens the communication from the steam-cylinder through the port 0, ports 0 of the ring It, and thence through the exhaust-chamber H to the exhaust-pipe E", while at the opposite end of the steamchest the valve P has moved into a position to permit the steam to pass from the steamspace I through the central opening of the plate F, thence through the ports 0 of the ICO ring R, and thence through the port Oiuto the steam-cylinder M.

In order to prevent the steam from leaking through the joint made in the ring R by severing the same between the eyce and nut n, I provide the inner circumferential faces of the end portions of said ring with eountersinks d d, and place therein a liner, Z, which spans the aforesaid joint, as illustrated in Fig. 2 of the drawings.

Having described my inveution,what I claim as new,and desire to secure by Letters Patent, 1s-

1. The combinatiomwith a steam-chest and piston-valve, of an adjustable valve-seat con; sisting of a contractible ring encompassing the valve, and an adjustable tightener for contracting said ring to compensate for the wear of the bearings between the ring and valve, as set forth.

2. ,The combination, with a stcam-chest and V piston-valve, of a contractible ring encompassing the valve, and an adjusting screw andspring for compressing said ring circumferentially, substantially as and for the purpose set forth.

3. The combination, with asteam-chest and piston-valve, of the severed contractible ring R, encompassing the valve and secured in the steam-chest, and provided with the eye 0 and nut n, the screw D, confined longitudinally in the steam-chest, and passing through the eye 0 and working in the aforesaid nut, and the= spring a, arranged to press the eye e toward the nut, substantially as described and shown.

- 4. The combination, with the steam-chest and piston-valve, of the contraetible ring R,

secured in the steam-chest and provided with the eye 0 and nut 02, the screw D, passing through said eye and working in the nut and 7 extended through the side of the steam-chest,

the collar 0, rigidly attached to said screw, the sleeve 1, interposed between said collar and side of the steam-chest, and the spring a,interposed between the collar and eye 0, substantially as described and shown.

'5. In combination with the steam-chest and piston-valve, the contractible ring R, secured in the steamchest, and provided with the ports O O, substantially as described and shown.

6. The piston P, in combination'with the steamchest A, formed with the exhaust-chamber H, steam-spaces I I, recesses 13 B, and

ports 0 O in said recesses, the rings R R, seated in the recesses and provided with ports 0 O, and the plates F F, confining the said rings in the recesscs,substantially as described and shown. a

7. In combination with the steam-chest and piston-valve, the contractible ring R, severed transversely, and provided with the countersinks d, and the liner Z,seated in said countersinks, substantially as described and shown.

In testimony whereof Ihavehereunto signed my name and affixed my seal, in the presence of two attesting witnesses, at Syracuse, in the county of Onondaga, in the State of New York, this 10th day of April, 1886.

JOHN E. MOINTOSH. [L. s.] Witnesses:

FREDERICK H. GIBBS, E. O. CANNON. 

